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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5f3b911a637e0413ae47dcc7b1b220920b45a660aca44e74787a51c696b87157' 
  AND token = 'tGQyINSbQIYpNYBm+sRdUjAMv5HL58mlPFrHAQCvn6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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