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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd0dc292fafe18b5294e9b3f94e2560ec5806dba6bbc90d57e1463cf6e6c6b299' 
  AND token = 'o0GOqtuxKBDJ7GyKNq14jOEp/BaXyzXc3JK9XaDu4Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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