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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f155c8fc0ce24ef8451fc93ee2396555fab7bf49628c8cdf9b0625d3ba9b8a56' 
  AND token = 'bStFp2xXxkhnfHo+Qk2KR3Q1iRBR7r0is7kYg3YqH+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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