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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd1a2ee35aa54a49402cc2d53bcd393d62f5ee946d3eaa363f6af6ddbed625289' 
  AND token = '7FyHcwHVOREPzzG88k+8wd7X5+0Bm1mm7kPwCE0b/C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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