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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3b2e0e7a126df54d3b44f730b62f5efd38e9465660b1c9beb89a5da1763f76f6' 
  AND token = 'UqJSGD7xTtyBpwkAB960jRySAVyDETFtuvDMkn1xCk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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