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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9b1977200e93d1cbc9a2b7d0c1a10003344b7640f3bf71b80edc6f4261dc2810' 
  AND token = 'InaYWFC18/wD4SX1JI/TtNc6ITPGaFH4vxYDp+YZ8oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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