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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'be667ba886ca7337bc6ca90cf489959969caadeda15974d7fa892e33c389402a' 
  AND token = 'cj7LYHZNzqzB0+OQ8jkxeUZMRdju071gMDC1kNBPsAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}