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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '575eb2b1e42a81dd4f9ced8ef5c146d2d76ecb9a8e4385f14cf029d5d1c61192' 
  AND token = '9tSOYDZ6Ku7wMrcmFJYvErABJz/L+OktKaECbrY5maw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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