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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0b5064b3b7ada8c49212db1f8bcb1974a94d0e0f8e8d25b0b86aed612d6e0680' 
  AND token = 'ajb/3nNsLMrCRQdhkvH43t21kdXIA63wRAYCOllLfqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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