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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9cd5f472355d955a91a526a22b89f5af3d2efec4510ec9ff0e7add0e01ef924b' 
  AND token = 'evFlTcVJ3Pd47yFtdrFFB1jbRABsUkZvRG0FdKHYeOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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