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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd850fc08ec6cb138f0ae921e3e524017c4aa2c66d54e475bcdf5bd53a3db601' 
  AND token = 'ejjuGeR4iw9noLPQDo/cZ9jQG+d3vfVWx9x5GFZP8fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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