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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dca4c6767fde029172f218be9011d5ce97ccba370b7cb2814794eae2e49e77aa' 
  AND token = 'C3mTCkK44+ZE2DwbsN5h7KabTRw6EQDIRXqjU+S6dFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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