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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a9343a2d2e21acafed3b686866cd21ffe15dd7a2ac6d2789efecfd5db985fe94' 
  AND token = 'UwGv4jvcQdvZvcrjMSyRBNebmKLDz9fbbZprr6dijiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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