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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cfea5c4c8bc00e49daccd0232d778e165c251ab6e0d993f911dbfc48a0cec87d' 
  AND token = 'Wf/M879kh0VFxdTQfT4aKyy2iGmh35N9feMTQRPKItM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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