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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c83128af5481c1c373fbacf23532063743d076ac085480af1e864fc2e75fe3a0' 
  AND token = 'uSklViymVMJXCRP8yGuIsr8lXJfL56G/ynL1yuBPoig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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