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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2a6b1b82f601a7a8906708f1617ed25c8abcc33398ad65b80f461bd700d6dd26' 
  AND token = 'u1nY8Y3FrAlnT23z5SkVL/pceTUadCgqnnlrXyv/6wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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