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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ebe6c8ad9fa021e26f8e9a7e6de61ff669d466b6514c1b5b8e4bccc62b451bf2' 
  AND token = 'q0LwnWD4EGzdYFdtYRex1oPp8MEzvVF5+d744ld/Q60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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